Front Panel LEDs

The Model 71861 XMC front panel has ten LED indicators, as shown in the drawing in Front Panel Connections.

Link LED

The green LNK LED indicates the link speed when a valid link has been established over the PCIe interface, as follows:

• Gen 1 − LNK LED will blink slowly (less than once per second)
• Gen 2 − LNK LED will blink approximate once per second
• Gen 3 − LNK LED will be constantly on

User LED

The green USR LED is for user applications.

Master LED

The yellow MAS LED illuminates when this 71861 is the Sync Bus Master. When only a single 71861 is used, it must be a Master.

PPS LED

The green PPS LED illuminates when a valid PPS signal is detected. The LED will blink at the rate of the PPS signal.

Over Temperature LED

The red TMP LED illuminates when an over−temperature or over−voltage condition is indicated by any of the temperature/voltage sensors on the 71861 PCB.

Clock LED

The green CLK LED illuminates when a valid sample clock signal is detected. If the LED is not illuminated, no clock has been detected and no data from the input stream can be processed.

ADC Overload LEDs

There are four red OV LEDs, one for each A/D input. Each LED indicates either an overload detection in the associated ADS5485, or an ADC FIFO overrun.